I have this array where I set the keys on the creation. Now in some point in my view I load some more information based on ids (the keys).
var colors = [
"37027" : UIColor(red:150/255, green:57/255, blue:103/255, alpha:1),
"12183" : UIColor(red:234/255, green:234/255, blue:55/255, alpha:1),
"44146" : UIColor(red:244/255, green:204/255, blue:204/255, alpha:1)
]
I want to add more colors to this array dynamically. How can I insert new items in the array setting the key? Something like
colors["25252"] = UIColor(red:244/255, green:204/255, blue:204/255, alpha:1)
The line above doesn't work, it is just to illustrate what I need.
Thanks for any help
Update: the code above is an example. Below the real code:
var placedBeacons : [BeaconStruct] = []
BeaconModel.fetchBeaconsFromSqlite(completionHandler: {
beacons in
for item in beacons{
self.placedBeacons["\(item.major):\(item.minor)"] = item
}
})
Error: Cannot subscript a value of type '[BeaconStruct]' with an index of type String
To match the key subscripting
self.placedBeacons["\(item.major):\(item.minor)"] = item
you have to declare placedBeacons as dictionary rather than an array
var placedBeacons = [String:BeaconStruct]()
It requires that item is of type BeaconStruct
The code you wrote, it should work. I have used such kind of code and was able to implement successfully. I just tested your code in my end and it's working for me. I declared colors variable globally in my class file and in view did load method added the second code to add another item in my colors array. After printing it out. My output shows full list of array with 4 items and the number of array count return 4 as well.
Please let me know, more details of your scenario so i can help you to figure it out the issue. but looks like it should work.
Related
I have solved the issue now, thanks for your help. I shouldn't have tried to save arrays with UITextViews, but I should have saved their text as strings instead. Here was the original question:
I have tried a lot, and googled a lot, but I can't solve this problem on my own. Whenever I try to save an array in userdefaults, it just is not working. I get the following error:
Thread 1: "Attempt to insert non-property list object (\n "<UITextView: 0x14001f800; frame = (0 0; 355 180); text = 'D'; clipsToBounds = YES; gestureRecognizers = <NSArray: 0x600003f01d10>; layer = <CALayer: 0x6000031c83e0>; contentOffset: {0, 0}; contentSize: {355, 30}; adjustedContentInset: {0, 0, 0, 0}>"\n) for key content"
I don't know what a non-property list object is. And I do not know how to solve the problem. Below is the lines of code that do not work.
var contentList: [Any] = []
let cl = defaults.array(forKey: "content")!
if cl.count != 0{
contentList += cl
}
contentList.append(label)
defaults.setValue(contentList, forKey: "content")
If I take out the last line of code by turning it into a comment everything runs just fine. How should I replace that line of code? I essentially want to save an array of UITextViews and make it larger every time I call a fucntion (this code is part of a larger function). The reason why I have created another two lists (cl and contentList) is that it helps me with a problem down the line. What I cannot understand however, is why the last line of code doesn't work. If anyone has any ideas, please help me, it would be much appreciated.
Use only String as stated in comments :
var contentList: [String] = []
let cl = defaults.array(forKey: "content")!
if cl.count != 0{
contentList += cl
}
If lbText = label.text {
contentList.append(lbText)
defaults.setValue(contentList, forKey: "content")
}
You can only store a very limited list of data types into UserDefaults, commonly referred to as "property list objects" (Since property list (or plist) files will only store the same data types.
To quote the Xcode docs on UserDefaults, in the section titled "Storing Default Objects":
A default object must be a property list—that is, an instance of (or for collections, a combination of instances of) NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary [or Data, String, NSNumber, Date, Array, or Dictionary types in Swift.] If you want to store any other type of object, you should typically archive it to create an instance of Data.
(I added the equivalent Swift types to the above quote in square brackets, since it looks like Apple hasn't updated it for Swift.)
That's worded a little awkwardly. The idea is that you can only store data of the types listed. Because the Array and Dictionary types are "container" types, you can store any combination of arrays and dictionaries that contain combinations of any of the above types. For example, you can store an array that contains a dictionary, 3 dates, 2 floats, a Double, some Data, and 2 arrays, and those dictionaries and arrays can contain other dictionaries and/or arrays.)
It is almost always wrong to archive UIView objects like UITextViews. You should save the text properties of your text views instead.
If you want to manage a vertical stack of UITextView objects, I suggest adding a vertical stack view to your user interface, and then writing code that adds or removes UITextView subviews to your stack view. You should be able to find plenty of examples of adding and removing objects from stack views online. (It's really easy.)
If you want to manage a scrolling list of feeds of arbitrary length, you might want to use a table view or collection view instead. Those require that you set up a data model and implement a "data source". That takes a little practice to get right, but is very powerful.
I am using a pod called iOSDropDown to display a dropdown selection menu for a textfield. I am getting a list of data from php to populate that selection menu that Im storing in a variable.
The PHP data passed stored in a swift variable looks like this when printed -> "option01","option02","option03"... and so on. This is dynamic data that will change that is why I am retrieving from PHP/MYSQL Database instead of just manually typing in the options in the Swift array.
Below is my code. What I am trying to do is use the "dropdownData" variable that holds the options for the array. Each option should be in its own row and separately selectable. What I am getting is one option, one string of coding with all my options as shown in the picture below.How would I use the dropdownData variable to display options instead of one string, one option?
dropdownData = "option01","option02","option03"... etc. ALL OPTIONS STORED IN THIS ONE ARRAY
let dropdownData : String = (dumpsArray[indexPath.row] as AnyObject).value(forKey: "dropdownData") as! String
.
cell.nameField.optionArray = [dropdownData]
Image
In the image above there should be no comma after styrofoam cooler... the next product should be the next option displaying under the styrofoam cooler and separately selectable.
Seems like dumpsArray[indexPath.row] as AnyObject).value(forKey: "dropdownData") returns a String where names are comma separated,
so
if let nameString = dumpsArray[indexPath.row] as AnyObject).value(forKey: "dropdownData") as? String {
let namesArray = nameString.components(separatedBy: ",")
cell.nameField.optionArray = namesArray
}
That should do
I am trying to create a label in openlayers. ( pop-ups I can do) .
My data comes from a PostgreSQL db.
I managed to create an array with the values like this:
var selectedFeatures = [];
ogc.getSource().forEachFeature(function(feature) {
selectedFeatures.push(feature.get("id"),feature.get("datum"),feature.get("fractie"), feature.get("tijd"));
});;
Now, how do I match the actual feature (id), with the right value (id)from the array?
And push this value to a variable?
You could use an object instead of an array, or an array of arrays indexed by the id
selectedFeatures[feature.get("id")] = [feature.get("datum"),feature.get("fractie"), feature.get("tijd")];
Can anyone teach me how to initiate/add items in array as section?
something like - array[["john"],["daniel"],["jane"]]
tried a few like var d = ArrayList<CustomClass>(arrayListOf<CustomClass>())
that does not work.
for example, if i add "david" i want it look like array[["john"],["daniel", "david"],[“keith"]] by finding the index of array contains letter "d"
how can i display them on a custom base adapter / listview? currently using a viewHolder
val viewHolder = ViewHolder(row.name) to display.
Thanks!
If I am right, you're trying to create an ArrayList that contains other ArrayLists. So writing:
var d = ArrayList<CustomClass>(arrayListOf<CustomClass>())
Won't work because the type of the main ArrayList is not String, but ArrayList. So you need to write:
var names = ArrayList<ArrayList<String>>()
names.add(arrayListOf("jane", "john))
Regarding the second question, check out this course that has a section about RecyclerView: https://classroom.udacity.com/courses/ud9012 If you are a beginner, I strongly encourage you to follow the whole tutorial.
I've imported several images into an actionScript 3 document. I've turned them all into symbols (movie clips) and given them instance names to reference from ActionScript.
Ok, so I'm putting the instances into an array so I can loop through them easily, but for some reason, whenever I'm putting in the instance name, I do a trace on the value in the array and it's giving me the symbol object back, rather than the instance object.
Basically trying to loop through the array to make each instance's visibility = false
Here's a sample:
var large_cap_extrusion_data: Array = new Array();
large_cap_extrusion_data[0] = large_cap_extrusion_menu_button;
large_cap_extrusion_data[1] = extrusion_border_large_cap
large_cap_extrusion_data[2] = "Large Cap";
large_cap_extrusion_data[3] = large_cap_main_menu_button;
var extrusion_data: Array = new Array();
extrusion_data[0] = large_cap_extrusion_data;
trace(extrusion_data[0][0]);
The traces gives:
[object large_cap_menu_button]
(the parent symbol)
rather than:
"large_cap_extrusion_menu_button"
I'd be very grateful if someone could tell me where I'm going wrong...
when you trace and object, by default it describes it type. What you want is the "name" property of the object.
Try this:
trace(extrusion_data[0][0].name);
that should give you the instance nema of the large_cap_menu_button rather than the class description. Either way, you have the right object I bet.